Expected δ13C shifts are absent in Tanzanian samples that span the majority of the Turonian Age (93.5 - 89.3 Ma). The δ13C values of bulk carbonate and organic carbon were measured throughout the Turonian section and showed ...

A 504-year tree ring carbon isotopic time series was generated using samples from living and subfossil white oak trees from northern Missouri. Over the interval from 1931-2002 [delta]¹³C is significantly correlated with ...

Measurements of conodonts, phosphatic brachiopods, and authigenic phosphate show no consistent trends in [delta]¹⁸Ophos values but do show a gradual 2-3 unit [epsilon]Nd increase across the Dubuque/Maquoketa contact in NE ...

To test competing interpretations of Late Ordovician climate evolution, sea surface temperatures were estimated from oxygen isotope ratios of single-species separates of conodont apatite from the mid-continent region of ...

This research provides the first of its kind empirical data regarding the evolution of Maastrichtian surface to deep ocean circulation in the North Atlantic. Differences in foraminiferal abundances and oxygen and carbon ...